Observations of soft X-ray spectrum from a Seyfert 1 and a narrow emission-line galaxy

Singh, K. P. ; Garmire, G. P. ; Nousek, J. (1985) Observations of soft X-ray spectrum from a Seyfert 1 and a narrow emission-line galaxy The Astrophysical Journal, 297 . pp. 633-638. ISSN 0004-637X

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Official URL: http://adsabs.harvard.edu/doi/10.1086/163560

Related URL: http://dx.doi.org/10.1086/163560


We report X-ray spectral observations of the Seyfert 1 galaxy Mrk 509 and the narrow emission-line galaxy, NGC 2992. Spectral analysis of the simultaneously obtained 0.2-4.0 keV pulse height data is presented. The absorbing column density NH, in the line of sight to Mrk 509 is found to be consistent with no absorption intrinsic to the source. A two-component spectrum in Mrk 509 is required, under the assumption that the galactic obscuration is at least that measured ona large scale by 21 cm line surveys. The soft spectral component in Mrk 509 is interpreted as thermal emission from a hot gas. The X-ray spectrum of NGC 2992 is well described by a single-component power law with photon index, Γ=1.78 and NH=4×1021 cm−2. The NH obtained in line of sight is less than the value predicted from the reddening of Balmer lines but comparable to that predicted from the nonstellar optical continuum. A partial covering by "patchy" absorbers is indicated for NGC 2992. The covered fraction seems to be variable over a time scale of a few years.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Galactic Nuclei; Seyfert Galaxies; X Ray Sources; X Ray Spectra; Active Galactic Nuclei; Emission Spectra; H Lines; Spectrum Analysis; Thermal Emission
ID Code:59041
Deposited On:03 Sep 2011 12:08
Last Modified:18 May 2016 09:45

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